HTML Entity for Sine Wave (∿)

Beginner
⏱️ 5 min read
📚 Updated: Jun 2026
🎯 1 Code Example
Unicode U+223F
HTML entity for Sine Wave (U+223F) — acd, hex, decimal, and CSS tutorial

What You'll Learn

How to display the Sine Wave (∿) in HTML using hexadecimal, decimal, named entity, and CSS escape methods. This character is U+223F (SINE WAVE) in the Mathematical Operators block (U+2200–U+22FF)—used in trigonometry, signal processing, and mathematical notation.

Render it with ∿, ∿, the named entity ∿, or CSS \223F. Do not confuse ∿ with the tilde operator U+223C (∼) or similar wave-like math symbols.

⚡ Quick Reference — Sine Wave

Unicode U+223F

Mathematical Operators

Hex Code ∿

Hexadecimal reference

HTML Code ∿

Decimal reference

Named Entity ∿

Standard HTML named entity

Reference Table
Name           Value
────────────   ──────────
Unicode        U+223F
Hex code       ∿
HTML code      ∿
Named entity   ∿
CSS code       \223F
Official name  Sine wave
Block          Mathematical Operators (U+2200–U+22FF)
1

Complete HTML Example

A simple example showing ∿ using hexadecimal code, decimal HTML code, the named entity, and a CSS content escape:

html
<!DOCTYPE html>
<html>
<head>
 <style>
  #point::after{
   content: "\223F";
  }
 </style>
</head>
<body>
<p>Sine wave (hex): &#x223F;</p>
<p>Sine wave (decimal): &#8767;</p>
<p>Sine wave (named): &acd;</p>
<p id="point">Sine wave (CSS): </p>
</body>
</html>
Try it Yourself

🌐 Browser Support

The Sine Wave (∿) is supported in modern browsers when fonts include Mathematical Operators glyphs:

Chrome1+
Firefox1+
Safari1+
Edge12+
Opera4+
Android4.4+
iOS Safari1+

👀 Live Preview

See the Sine Wave in mathematical and scientific contexts:

Single symbol ∿
Trigonometry f(x) ∿ sin(x)
Named entity &acd; renders as ∿
Signal processing AC waveform ∿ 60 Hz
Numeric refs &#x223F; &#8767; &acd; \223F

🧠 How It Works

1

Hexadecimal Code

&#x223F; uses Unicode hexadecimal 223F to display the sine wave symbol.

HTML markup
2

Decimal HTML Code

&#8767; uses decimal Unicode value 8767 for the same character.

HTML markup
3

Named Entity

&acd; is the standard HTML named entity for U+223F—readable and widely supported in math markup.

HTML markup
4

CSS Entity

\223F is used in CSS stylesheets in the content property of pseudo-elements.

CSS stylesheet
=

Mathematical symbol result

All four methods render ∿. Unicode U+223F in Mathematical Operators. Next: Single High Reversed 9 Quotation Mark.

✅

Use Cases

The Sine Wave (∿) commonly appears in:

📈 Mathematics

Equations, formulas, and operator notation involving sine functions.

📚 Trigonometry

Educational content, textbooks, and tutorials on sine waves.

📡 Signal processing

Electronics, telecommunications, and AC waveform documentation.

⚗️ Scientific content

Physics, engineering, and research papers with wave notation.

💻 Web applications

Calculators, STEM tools, and interactive math interfaces.

📖 Technical docs

Mathematical Operators and HTML entity reference guides.

💡 Best Practices

Do

  • Use &acd; for readable HTML source in math content
  • Set <meta charset="utf-8"> for reliable rendering
  • Verify font support for Mathematical Operators across devices
  • Provide plain-text context for accessibility in equations
  • Pick one reference style per project for consistency

Don’t

  • Use padded Unicode notation like U+0223F—the correct value is U+223F
  • Put CSS escape \223F in HTML text nodes
  • Confuse ∿ with tilde operator ∼ or similar symbols
  • Assume every wavy symbol is the sine wave operator
  • Mix entity styles randomly in one file

Key Takeaways

1

Four ways to render U+223F in HTML and CSS

&#x223F; &acd;
2

Named entity &acd; is the most readable option in HTML markup

3

Unicode U+223F — SINE WAVE

4

For CSS stylesheets, use \223F in the content property

5

Previous: Sigma (Σ)   Next: Single High Reversed 9 Quotation Mark (‛)

❓ Frequently Asked Questions

Use &#x223F; (hex), &#8767; (decimal), &acd; (named entity), or \223F in CSS content. All four render ∿.
U+223F (SINE WAVE). Mathematical Operators (U+2200–U+22FF). Hex 223F, decimal 8767, named entity &acd;.
For mathematical notation, trigonometry, signal processing, scientific formulas, educational content, and any context requiring the sine-wave operator symbol.
&acd; is the readable named entity. &#8767; and &#x223F; are numeric references. All render ∿; prefer &acd; in HTML source when readability matters.
HTML references go in markup; the CSS escape \223F goes in stylesheets (e.g. content on pseudo-elements). Both render ∿ in their respective contexts.

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About the author

Mari Selvan M P
Mari Selvan M P 🔗

Developer, cloud engineer, and technical writer

  • Experience 12 years building web and cloud systems
  • Focus Full Stack Development, AWS, and Developer Education

I write practical tutorials so students and working developers can learn by doing—from databases and APIs to deployment on AWS.

AWS Certified Developer – Associate (Credly)

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Sigma Single High Reversed 9 Quotation Mark